Angelus1818 of course its possible to do that with any 3d program the whole image sequences render it to multiple images pngs or whatever you want with transparency. So you dont need to buy any plugin to do that. blender is free is powerfull and do the same job with one button too..
beware that many assets or most of them are cost some $$$ so its not only the 10$ for the plugin its more for the models.
i dont argue that this plugin is helpfull yes it is but the same job can be done for free and easy too.
I encourage you to try some 3d modelling program cause the happiness of creativity and the originality at least for me is the goal at the end of the day. Why should i buy an asset and dont create my 3d model. the asset is possible to download it over 1000 users and add it to their games. my model whould be only in mine. and who knows maybe i sell it too in the future.
ps sorry what do u mean by "I always had to edit out the background myself, and that takes a long time for *every* photo you convert"?
if you mean that you try to make the backround transparent around your model then try to render it in blender internal renderer and change in shading options in alpha from "sky" to "transparent" or if you use cycles renderer check the box transparent in film options. there you go now you have a transparent backround the need of any editing..